Refillable fuse.



0. H. JUNG- REFILLABLE FUSE.

APPLICATION FILED FEB. 17. 1915.

1 1 82, 1 76. Patented May 9, 1916.

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OSCAR H. JUNG, OF MILWAUKEE, WISCONSIN.

REFILLABLE FUSE.

Specification of Letters Patent.

Patented May 9, 1916.

Application filed February 17, 1915. Serial No. 8,729.

To all whom it may concern:

Be it known that I, OSCAR H. J one, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented new and useful Improvements in Refillable Fuses, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The invention relates to renewable electric thermal fuses.

This invention belongs to those type of thermal fuses which are inserted in an electric circuit and carry a fuse designed to take an electric current of certain voltage and amperage so that when the current through the circuit exceeds the voltage and amperage which the fuse will carry or blows out and thus breaks the circuit and thus prevents injury to electrical units in the circuit and in the present instance after such a blow out occurs the thermal fuse link may be readily replaced.

Heretofore renewable thermal fuses have been made in which the fuse link is removably mounted in an integral tubular casing by detachably securing the fuse blades or terminals to the ends of the casing. With constructions of this kind the fuse blocks have to be removed from the casing or detached from the ends of the same before the fuse link can be replaced and much time is wasted in accomplishing the renewal of the fuse and links cannot be readily inserted.

To obviate this difiiculty it is my purpose to provide a split casing made up of a plurality of easing members with means for securing the parts of the casing together and for securing the fuse blocks or blades at the ends of the casing. With my construction all that is necessary to inspect or renew a fuse is to remove the casing member securing means and remove one side of the casing to disclose the fuse and its terminal connections.

The invention further designs to provide a casing for a renewable thermal fuseconsisting of a plurality of members forming a tubular casing and means detachably securing said casing members together to inclose the fuse link and secure the terminal members of the links to the casing.

The invention further designs to provide a renewable thermal fuse in-which the cas ing is insulated from terminal blades of the fuse.

the fuse melts The invention further designs to provide a fuse casing made of a molded waterproof and fire-proof composition.

The invention further designs to provide a fuse having a casing made up of a plurality of detachable casing members so that the fuse may be replaced from the side of the casing.

The invention further designs to provide a fuse having a casing made up of a plurality of sections detachably secured together and provided with dowels which extend through apertures in the blade terminals to hold said blades in position.

The invention further designs to provide a new and improved form of renewable electric thermal fuse.

The invention consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings, Figure 1 is a view of the device wit one of the sections removed;

2 is a .ertical sectional view of the device; Fig. 3 is a section taken on line 3-3 of Fig. 2: Fig. 4 is a section taken .on line 4-4 of Fig. 2; Fig. 5 is a section taken on line 5-5 of Fig. 2: Fig. 6 is a view of a modified form of the device showing the sections removed; Fig. 7 is a vertical sectional View of the modified form of the device; Fig. 8 is a section taken on line 8-8 of Fig. 7; Fig. 9 is a detail non-central sectional View through the device, showing the interlocking connection between the ends of the sections of the casing.

The device shown in Figs. 1 to 5 inclusive comprises a thermal fuse link 9, terminal blades 10, means for detachably securing the ends of the link to the blade, a sectional casing 11, means for detachably securing the sections of said casing together, means for positioning the blades in the casing, and means for closing the openings in the casing adiacent the blades.

The means for detachably securing the ends of the link 9 to the terminal blades 10 comprise screw bolts 12 passing through apertures 13 in the ends of the link and through apertures 14 in the inner ends of the, blade and provided with nuts 15 to se cure the ends of the link 9 to the inner ends of the terminal blades.

The casing 11 comprises a plurality of sections 16 and 17 which co-act together to form a cylindrical casing for inclosing and positioning the fuse link 9 therein and for securing the terminals such as theblades 10, in position. Though I have shown a casing composed of two sections it will be-obvious that I may employ more than two sectional members to form the casing. However, I preferably provide two oppositely disposed interlocking sections 16 and 17. Each of these sections consists of amember having a substantially semi-cylindrical interior 18 and a substantially semi-cylindrical exterior 19 and end'portions 20 to form a substantially semi-cylindrical shell with closed ends. The intermediate portion of the top of each of the ends 20 is provided with a projection 21 forming adowel which is designed to extend part way into one of the apertures 22 in one of the. blades 10, but is loosely disosed therein to permit vertical movement of the blade. The means for interlocking the sectigns together consists of a projecting rib 23 adjacent the semicircular interior portion and the ends 20 on one side of the sectionwhich interlocks with a corresponding recesmd portion 24 adjacent the seinicircular interior portion and the ends 20 on the other side of the adjacent section. Thus as each of the sections are provided with a projecting rib 23 on one side and a recessed portion 24; on the other, the ribs 23 of 'one section co-acts with the recess 24 of the othe to interlock the sections together. In addition toth'e 1nterlock1ng tongue and groove connection the longitudinally extending co-,

acting edges. of the sections have horizontally extending portions 25. The vertical portion of the ribs and the recess form a means for preventing the emission of the discharge when the iuSe blows out which might occur if the edges were plain horizontally extending edges. At the end 20 of the sections the ribs are on the inner side of the sections and the contacting edges of the end 20 each consist of a horizontally extending portion 26, a vertically extending portion 27, a horizontally extending intermediate portion 28 from which the dowel 21, above described, projects, a vertical portion 29'and a horizontally extending portion 30. These ends fit together as shown in Fig. 3, the blade terminals fitting between the intermediate horizontally extending and vertical portions of the edges of the ends and being held therein by the dowels against lateral movement in one-direction with respect to the movement of the casing, but capable of limited lateral movement with respect to its 7 flat sides. The exterior of the casing sections adjacent their ends are provided with ribs 31 which form continuous ribbed rings around the exterior of the case and are used rings; 32 which are adapted to be slipped over the ends of the sections whcntheyare assembled together and are pushed downlto abut against the ribbed rings 31 on the ex terior of the sections. It is to benoted that the rings 32 are not connected in any way with the terminal blades, but are insulated therefrom by a portionof the casing so that, unlike most fuses, the operator may grasp ,the casing without fear of a shock should he take hold of the rings and this construction also permits him to get a good grasp on the whole casing to reniove the f use from the line.

The means for positioning the blades vhas been previously described and consists of the dowels or projections 21 on the edges of each of the ends 20 which project through apertures 22 in the blades 10 and whose ends 33 abut against each other.

The means for closing the openings in the casing adjacent the blades comprises a plurality of rings of fire-proof material, such as asbestos, each of said rings having a diametrically.cxtending slot 35 therein whose width is the width of the blade plus the thickness of the fuse link and whose length is suilicientto allow a portion of the ring to extend from either side of the blade as shown in Figs. and 5. In practice a pair of these rings are superimposed upon one another with their slotted portions extending in op- ,posite directions so that that portion; of the slot of one ring adjacent the side of the blade is covered up by the part adjacent the slot of the other ring as shown by the dotted and full line positions of the slots 35 in Fig. 5.

\Vith -the construction described, if the fuse link 9 blows out the operator grasps the casing any Where along its cylindrical exterior without fear of injury and moves it from the line then slips the rings 32 0d the ends then lifts one of the casing sections away from the other, This removal ofthe casing section not only shows the condition of the interior of the casing with the-fuse link and terminal blocks exposed therein (as shown in Fig. 1) but also permits the blades to be lifted (3c the dowels on the other section so that a new fuse may be connected ,up between them, and the new fuse and the blades may then be quickly replaced and the removed section returned to its place and all the fuse and the means be readily and quickly done in the manner above described. Thus the construction per- :nits the renewal of the fuse from the side of the case in contradistinction to those in which the fuse is renewed by removing the ends of the casing and results in a construction which saves considera le time in renewing the fuse or inspecting it.

In Figs. 6 to 8 inclusive I have shown a modified form of the device in which the ends of the casing are inserted in the line, said ends having an electrical connection with the fuse link.

The modified device comprises a link 36, a sectional casing 37, means for detachably securing the sections of said casing together, which means also forms the terminals of the fuse, means for electrically connecting the fuse link 36 to said terminals and means for positioning the fuse link and electrical connecting means.

The sectional casing 37 comprises a pair of members 16' and 17' similar to the sections 16 and 17 previously tongue and groove connections 23' and 24' similar to the ribs 23 and recesses 24 previously described.

The means for detachably securing the sections 16 and 17 together comprises split rings 32 similar to the rings and which are adapted to be slipped over the ends of the sections when they are assembled toget-her and are pushed down to abut against the ribbed rings 31 similar to the rings 31. These rings 32 also form the terminals of for electrically connecting them with the fuse comprises a plurality of metal bands 38 having portions 39 extending along the exterior of the casing, end 40 extending into slots 41 in the exterior of the casing, portion 43 extending along in recesses 44 in the end edges of the casing sections and ends 45 bent up against the ends of the casing sections in the interior thereof. The fuse link 36 is secured between oppositely disposed bands 38 as shown in Fig. 7 and its ends extend outwardly therefrom. The recesses 44 in the casing section serve to hold both the bands and the fuse link and the split rings 32 fit over that portion of the bands 38 on the exterior of the casing section and thus hold the elements of the fuse together. The band 38 completes the circuit from the fuse link 36 to the rings 32 which are connected to the line.

\Vith the modified form of construction above described, if the fuse link 36 blows out the operator removes the fuse from the line, takes off the rings and lifts off one of the sections after which the old fuse may be readily removed and replaced with a new fuse, the casing reassembled and the rings replaced.

The invention thus exemplifies a. renewable fuse in which the link may be readily redescribed and have newed by removing the retaining means from the detachable casing sections to permit the removal of one of said sections to thereby permit the replacement of the fuse.

The invention is not to be restricted to the details of construction herein set forth but may be varied so to be within the scope of the appended claims.

\Vhat 1 claim as my invention is:

1. A casing for a fuse consisting of a, plurality of complementary sections of insulating material, each section having a hollow interior portion and a solid end portion integral therewith, an interlocking tongue and groove connection formed in the joming edges of said sections to prevent endwise movement of said sections with respect to each other. and means for detachably securing said sections together.

In a renewable fuse, a casing consisting of a plurality of complementary sections of insulating material, means integral with said sections for securing them against movement in the plane of their adjoining edges, each section having a hollow interior portion and a solid end portion integral therewith, and means for detachably securing said sections together.

3. A casing for a fuse consisting of a plurality of complementary sections of insulating material, each section having a hollow interior portion and a solid end portion integral therewith, an interlocking tongue and groove connection formed in the joining edges of said sections adjacent the interior thereof to prevent lateral and endwise movement of said sections with respect to each other, and means for detachably securing said sections together.

4. In a renewable fuse. the combination, with a fuse link provided with terminals, a casing for inclosing said link comprising a plurality of side sections assembled together to permit the removal of the link from the side of the casing, means integral with said casing engaging with means in said terminals to position and hold said link, and means for detachably securing said sec tions together.

In a renewable fuse, the combination, with a fuse link. of terminal blades detachably secured to said link. a casing for inclosing said link comprising a plurality of side sections assembled together to permit the removal of the link from the side of the casing. means integral with said casing engaging with means in said blades to position and hold said blades, and means for detachably securing said sections together.

6. In a. renewable fuse, the combination, with a {use link, of terminal blades detachably secured to said link and having apertures therein, a casing for inclosing said link and a portion of said blades comprising a plurality of side sections, means on said casing sections and integral therewith coacting with the apertures in said blades for positioning said blades in the casing, and means for .detachably securing said sections together.

7. In a renewable fuse, the combination, with a fuse link provided with terminals, a casing for inclosing said link and a portion of said terminals comprising complementary shell sections of insulating material having integral solid end portions, said end portions having registering recesses therein for receiving and positioning said link within the casing, an interlocking connection between integral portions of the ends of said sections and the terminals of the link for preventing endwise movement of the link within the casing, and means for detachably securing said sections together.

8. In a renewable fuse, the combination, with a fuse link, of terminal blades detachably secured to said link, a. casing for inclosing said link and a portion of said blades comprising complementary shell sections having registering recesses therein for receiving and positioning said blades in the casing, and means integral with said casing engaging in said blades for locking said blades against movement in said recesses, and means for detachably securing said sections together.

9. In a renewable fuse, the.combination, with a fuse link, of terminal blades connected to said link, a casing for inclosing said link and a portion of sai'd blades comprising shell sections having solid end portions, an interlocking connection between integral portions of the ends of said sections and said blades for locking said blades against movement with respect to the casing and for positioning the blades therein, and means for detachably securing said sections together.

10. In a renewable fuse. the combination, with a fuse link, of terminal blades having apertures therein and detachably secured to said link, a casing for inclosing said link and a portion of said blades comprising complementary shell sections having in tegral solid end portions, said solid end portions having registering recesses and projecting tongues, said blades disposed within said recesses and said tongues disposed within the apertures in said blades to position and hold said blades in said using, and means for detachably securing said sec tions together.

ll. In a renewable fuse, the combination, with a fuse link and terminal blades connected thereto, of a casing for inclosing said link and. dctachably holding said blades in position. comprising complementarv shell sections of insulating material having hollow link inclosing portions and integral solid ends, an interlocking connection between said sections and integral therewith to prevent their movement in the plane of their adjoining edges, an interlocking connection between integral portions of said sections and said blades lo prevent endwise movement of the blades with respect to the casing, and means for detachably securing said sections together whereby on the removal of the securing means and one sections, both link and blades may bum" removed from the casing.

12. in a renewable fuse, the c m1bioatioin with a fuse link, and terminal blades detachablv connected thereto, of a casing tor inclosing said link and detachablv holding said blades in position comprising complen'ientanv interlockable shell sections of or sulating material having hollow link inclosing portions and integral solid ends having non removable portions engaging the blades and holding them against emlwise movement wherebv both link and blades ma be bodily removed from the side of the r g on the removal of one of said sections. and means for detachabl securing said sections together.

13. In a renewable fuse, the combination. with a fuse link and terminal blades connected thereto, of a casing for inclosing said link and detachablv holding said blades in position. comprising complementary shell sections of insulating material inning hol-- low linlcinclosing' portions and integral solid ends, an interlocking connection be tween said se -thins and integral therewith to prevent their movement in the plane at their adjoining edges, an interlocking o 'tion between integral portior sections and said iidadvs to prevent us lw and lzili'lal movement of the blades respect to the casing, and .rcm zi ah rings fitting over the outside of said Ff adjacent the ends thereof for dctacha s curing said sections together whereby both link and blades mav be bodily removed from the casing on the removal of said ring; and one oi" said sections.

:In testimony whereof I ailix my signature in prrsrnco of two witnesses.

OSCAR ll. JUN l,

llitnosses:

WM. T. KHZICK, Louis 0. FRENCH.

Copies of thin patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington. D. 0. 

